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Proceedings 2017, 1(8), 796;

Portable Multi-analyte Sensor System for On-Site Monitoring of Fermentation Processes

Institute of Nano- and Biotechnologies, FH Aachen, Heinrich-Mußmann-Straße 1, 52428 Jülich, Germany
Department of Pharmaceutical Chemistry, Philipps-Universität Marburg, Marbacher Weg 6-10, 35037 Marburg, Germany
Institute of Complex Systems (ICS-8), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße 1, 52425 Jülich, Germany
Presented at the 5th International Symposium on Sensor Science (I3S 2017), Barcelona, Spain, 27–29 September 2017.
Author to whom correspondence should be addressed.
Published: 6 December 2017
(This article belongs to the Proceedings of the 5th International Symposium on Sensor Science (I3S 2017))
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Process control of complex fermentation processes requires monitoring of various key parameters. In this regard, knowledge about specific process-related metabolites, in particular, is of great interest. Herein, an electrochemical multi-analyte sensor system is presented that enables simultaneous analysis of four different metabolites, namely ethanol, formate, D- and L-lactate. The platinum sensor chip (14 × 14 mm2) comprises five working electrodes (each 2 mm in diameter) and an integrated counter electrode. Each working electrode is functionalized with an immobilized enzyme membrane, consisting of a specific nicotinamide adenine dinucleotide (NAD+)-dependent dehydrogenase in combination with a diaphorase from Clostridium kluyveri. Amperometric detection is performed at an applied potential of +0.3 V vs. Ag/AgCl by anodic oxidation of enzymatically produced ferrocyanide. Thereby, the generated current is proportional to the analyte concentration in the sample solution. The compact and portable electrochemical sensing device comprises the biosensor chip in combination with a multiplexer potentiostat. In this way, rapid on-site monitoring of organic acids and alcohol is realized. Additionally, application of the sensor system in real samples from a biogas plant will be presented in this work.
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Pilas, J.; Selmer, T.; Keusgen, M.; Schöning, M.J. Portable Multi-analyte Sensor System for On-Site Monitoring of Fermentation Processes. Proceedings 2017, 1, 796.

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